well my opponent attacked with his Red Dragon Archfiend, and i activated the trap mirror force. my opponent activated the effect of Stardust Dragon and tributed him to negate Mirror Force. At the end of his turn, he special summoned Stardust Dragon back from his grave due to it's effect. Now here is my question:

Stardust didn't attacked this turn, is he than destroyed due to the effect of Red dragon Archfiend or not? Cause both effects are in the end phase, but I can't figgure out wich effect kicks in first.

Yes, Stardust is destroyed. Stardust's effect resolves once it comes back to field. Soon as it hits field Red Dragon destroys it. For added information, Stardust's effect cannot be chained to Red Dragon's.

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